Transcript Virtual experiments for teaching and training

Virtual experiments
in University teaching
Kim Lefmann
MCNSI public, ISIS, 27/9-05
New University neutron course
• University of Copenhagen, 4th year physics (+Ph.D.)
• 10 hours per week, 8 weeks
• Lecturers: Kim Lefmann, Peter Willendrup,
Bente Lebech, Kell Mortensen
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Theory (Squires) and simple calculation problems
Data analysis (Fullprof, Mfit)
3 reports on McStas simulations (DMC, RITA-2, SANS-2)
Plus 3 (6) full days experiments at PSI
One final report, no exam
Course plan (week by week)
• 1: Introduction (neutrons + McStas), materials, Squires ch. 1
• 2-3: Scattering theory, (powder) diffraction, FULLPROF,
DMC Project (crystal structure), Squires ch. 2-3 (elastic)
• 4-5: Inelastic scattering, phonons, MFIT, RITA-2 project
(phonons), Squires ch. 2-3 (inelastic)
• 6-7: SANS, “SANS-software”, SANS-2 project, Notes
• 8: Magnetic scattering, Squires ch. 7-8
• “9”: PSI experiments, (comparing with simulations)
Project 1: DMC (PSI)
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PSI cold source
Straight guide
Flat monochromator
Collimator
Powder sample
Banana detector
(+ diagnostic
monitors)
• Data analysis in
FULLPROF
Project 2: RITA-2 (PSI)
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PSI cold source
Straight guide
Curved monochromator
Soller collimator
Vanadium / phonon sample
Single analyzer
Single detector
(+ diagnostic monitors)
• Data analysis in MFIT
Project 3: SANS-2 (PSI)
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PSI cold source
Straight guide
Velocity selector
Pinhole collimation (3/6 m)
SANS sample
PSD detector
(+ diagnostic monitors)
• Simple data analysis
(Gunier, Perot)
• (right) Virtual data.
Hard spheres, 50 nm,
Real experiments
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PSI, 23-29 June 2005
2 groups of 3 M.Sc. students
SANS-2 under repair
RITA-2, 3 days each
• No repetition of simulations!
• Spin wave projects
(α-MnMoO4)
• Data analysis in MFIT
• Students very self confident
even tough instrumentation
(multi-analyzer mode)
Conclusion
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M.Sc. students like the approach (continue with neutrons)
Excellent student reports!
“hands-on” experience to instrumentation
Students act experienced on Day-1
Better understanding for semi-experienced Ph.D. students
• Good beta-test of McStas 1.9!
• Focused efforts to get virtual experiment concepts tested
• This will be continued!